netanyahu. he was even joking about red lines. but the issue couldn't be more serious, the real red line is the one netanyahu talked about at the united nations last fall. >> a red line should be drawn right here. >> reporter: the point where iran must be attacked or it will be able to build a nuclear bomb. a red line israelis believe could be crossed within months. the issue was front and center here in all of the president's meetings. >> diplomacy and sanctions so far have not stopped iran's nuclear program. in order to stop iran's nuclear program peacefully, diplomacy and sanctions must be augmented by clear, credible threat of military action. >> reporter: the president said he believes there is time for diplomacy. but -- >> the united states will continue to consult closely with israel, on next steps, and i will repeat, all options are on the table. we will do what is necessary to prevent iran from getting the world's worst weapons. >> reporter: iranian missiles like this one they tested in